Pump-piston.



PATENTED JULY 18, 1905.

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R ADDISON PUMP PISTON.

APPLICATION FILED MAY 23, 1904.

WITNESSEEj MM UNITED STATES Patented July 18, 1905.

ROBERT ADDISON, OF POMONA, CALIFORNIA.

PUMP-PISTON.

SPECIFICATION forming part of Letters Patent No. 794,834, dated July 18, 1905.

Application filed May 23, 1904. Serial No. 209,354.

To all whom, it may concern:

Be it known that I, ROBERT ADDISON, a citizen of the United States, residing at Pomona, in the countyof Los Angeles and State of California, have invented new and useful Improvements in Pump-Pistons, of which the following is a specification.

My invention relates to improvements in pump-pistons, the objects being to provide a piston for use on pump-rods that will to a certain extent remove the objectionable pounding occasioned in double-piston pumps particularly or in pumps wherein a single piston is used, thus avoiding the wear and tear on the piston occasioned by such pounding, and to increase the efficiency of the pump and connected machinery, as well as prolonging the life of the pump and its operating parts.

To these ends my invention consists in the novel features of construction and combinations of parts, such as will be more fully described hereinafter and particularly pointed out in the claims. Inthe accompanying drawings, Figure 1 is a view in side elevation of my improved piston. Fig. 2 is a central vertical section therethrough. Fig. 3 is a top plan view of the piston. Fig. 4 is a top plan view of the skeleton piston-frame. Fig. 5 is a detail perspective view of one of the piston-valves; and Fig. 6 is a view in side elevation of a double-piston cylinder, parts being broken away to show my improved piston in position.

The piston consists of a skeleton frame K,

preferably cylindrical and provided with a central vertically-extending boreB, designed to receive the piston-rod C, which rod is threaded at its lower end for the reception of a lock-nut E, by means of which latter the piston is removably held on the rod. The piston-rod also passes through a hollow rod F, on which is carried a similar piston fitting in the pump-cylinder, the piston-rods recipro eating toward and from each other, as custhe upper ends of the arms.

H H, whereby are formed a number of verticall y-extendin g segmental passages or ports 1 1. The upper ends of these arms extend above the upper end of the outer shell and are provided with inclined edges leading from their highest point to the upper edge of the outer shell, as shown, an exterior shoulder 2 being formed about the hub and connecting The upper edge of the outer shell or casing is cut away or recessed to leave a plurality of upstanding ears K K, each having a bearing formed therein.

Received upon the hub 3, which extends some distance above the outer shell ofthe frame K, is an annular sleeve J, which is held in position against the upper end of the shoulder 2 by means of the locking-sleeve 4., and this sleeve J is provided with radiallyextending ribs 5 5, curved on their lower faces, as shown in Fig. 2, the outer ends of the ribs being connected, strengthened, and braced by means of a ring 6.

In order to close the upper ends of the ports 1 1, I provide the hinged valve-leaves I 1, comprising plates of substantially the shape of the ports, one side of each of the valve-plates being faced with leather M or other suitable material to serve as packing therefor. These valves are each provided with a rounded lug I at one end adapted to be received in'the bearings K, formed on the outer shell, Whereby to hinge the valves thereto, and located on each side of the rounded lug are the projecting noses L L,'adapted to embrace the ears K K to prevent lateral movement of the valves and also to serve as stops to prevent the valves from swinging open too far. The opposite end of each valve-plate is provided with a centrally-disposed longitudinally-extending recess 7, between the walls of which is received the rib 5, and at the rear end of the recess is located a projection 8, one edge of which conforms to the contour of the curved or arc-shaped edge of the rib. The curvature of this rib is such that the valve may be raised to the position shown in dotted lines in Fig. 2; but from that point the rib extends horizontally to the ring 6 and is of suflicient depth to prevent the further opening of the valve.

In other words, the curvature of the rib is on an arc concentric with the arc described by the free edge of the valve to that point where the valve is shown in dotted lines in Fig. 2, from which point the arc of the rib is mutilated to prevent the further movement of the valve, the rib engaging the bottom of the recess 7 and the projection 8. It will be observed that the ribs serve both as guides and stops for "the valves and that they alternate with the radial arms H H of the skeleton frame of the piston, the valves fitting over and closing the ports 1 1. The free edges of the valves rest upon the outer edge of the shoulder 2 on the hub 3.

I have also provided my piston with the usual packing-rings, the outer shell of the piston-frame K having a series of stepped shoulders 9 10 formed eXteriorly thereof and being threaded at its lower end, as at 11. The upper packing-ring G is placed in position, as shown, the ring occupying the cut-away portion between the stepped shoulders 9 and 10, one edge of the packing-ring being caught between shoulder 9 and an annulus 12, loosely encircling the frame K. The lower packingring Gr lies behind the shoulder 13 of the loose annulus, the lower edge of the packing-ring G being retained between the lower edge of the loose annulus and the threaded lockingring 14, whereby the packing is removably clamped in position.

It is evident that as the piston moves downwardly the valves will be forced upward to their open position, allowing a free and straight passage therethrough, and the moment this downward movement ceases the valves will close, owing to the weight of the liquid being pumped.

The piston is of course suitable for use with other than double-piston pumps;

From the foregoing it will be obvious that many changes might be made in the form and arrangement of the several parts described without departing from the spirit and scope of my invention, and hence I do not wish to limit myself to the exact construction herein set forth; but,

'Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a pump-piston, the herein-described pivoted valve comprising a leaf, a rounded lug located at one end of the leaf and integral therewith for placement in a socket in the frame of said piston, and noses disposed on either end of the lugs, and integral therewith, a piston-frame provided with a socket-bearing to receive the lug and means for limiting the movement of the leaf on the opening stroke thereof.

2. A pump-piston comprising a skeleton frame, the frame consisting of an outer shell, a hub having a bore therein and surrounded and inclosed by the outer shell, and a series of radial arms connecting the shell and hub to form a series of ports between the hub and shell and valves closing the ports.

3. A- pump piston comprising an outer shell, a hub inclosed by the shell, radial arms connecting the hub and shell to form ports, a shoulder formed on the hub, upstanding ears having bearings formed therein and located on the shell, and valves pivoted in the ears and engaging the shoulder to close the ports.

4. A pump piston comprising an outer shell, a hub, radial arms connecting the shell and hub to form ports, upstanding ears on the shell, the ears having bearings formed therein, 1

valves for controlling the ports, rounded lugs located at one edge of the valve and received in the bearings in the ears and projecting noses carried by the valves on each side of the lugs and embracing the ears.

5. A pump piston comprising an outer shell, a hub, inclosed within the shell and radial arms connecting the shell and hub, the hub projecting above the upper end of the shell, a shoulder on the hub, a sleeve received upon the hub and engaging the shoulder, valves pivotally secured to the outer shell, the free ends of the valves resting upon the shoulder and means carried by the sleeve and engaged by the free ends of the valves for guiding the same and limiting their movement in one direction.

6. A pump piston comprising an outer shell, a hub and radial arms connecting the shell and hub to form ports, a valve pivotally secured to the shell, the free end moving toward and from the hub and means carried by the hub for limiting the outward movement of the valve.

7 A pump piston comprising an outer shell, ahub,and radial arms connecting the hub and shell to form ports, a valve pivotally secured to the shell, the free end of the valve swinging toward and from the hub, and means carried by the hub and engaged by the free end of the valve, the means being curved for a portion of its length only in an arc concentric with the are described by the movement of the free end of the valve.

8. A pump-piston comprising a frame provided with a port, a valve pivotally secured to the frame, the free end of the valve being recessed, a rib overhanging the frame, and received in the recess in the free end of the valve, the lower edge of the valve being curved for a portion of its length in an arc concentric with the are described by the free end of the valve in its movement.

9. The combination in a pump-piston provided with a frame and a hub carried thereby and projecting thereabove, of a shoulder located exteriorly of the projecting portion of the hub, a valve hinged to the frame, the free end of the valve engaging the-shoulder, a

sleeve resting upon the shoulder, means for removably locking the sleeve in position and a radially-projecting rib carried by the sleeve and engaged by the free end of the valve.

10. The combination in a pump-piston provided with a frame, and a hub projecting therebeyond, of a valve pivoted at one end to the frame, the free end of the valve provided with a recess, a projection located on the valve at the closed end of the recess and a curved rib carried by the hub and received in the recess.

11. In a pump-piston, the combination with a frame and a hub projecting therefrom, of valves pivotally secured to the frame, the free ends of the valves being recessed, a projection located at the closed end of each of the recesses, a plurality of curved ribs projecting from the hub, and received in the recesses in the valves, and a ring connecting the outer ends of the ribs.

12. In a pump-piston, the combination with a frame and a hub, of a valve pivotally secured to the frame and recessed-at its free end, and a rib projecting from the hub and received in the recess in the valve, a portion of the lower edge of the rib being curved concentric with the are described by the movement of the free end of the valve, the outer end of the rib being straight to serve as a stop for the valve.

In witness that I claim the foregoing I have hereunto subscribed my name this 16th day of May, 1904:.

ROBT. ADDISON. Witnesses:

HENRY T. HAZARD, G. E. HABPHAM. 

